CVE-2003-1123 in JRE
Summary
by MITRE
Sun Java Runtime Environment (JRE) and SDK 1.4.0_01 and earlier allows untrusted applets to access certain information within trusted applets, which allows attackers to bypass the restrictions of the Java security model.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 12/20/2024
The vulnerability described in CVE-2003-1123 represents a critical security flaw in the Sun Java Runtime Environment and Software Development Kit versions 1.4.0_01 and earlier. This issue fundamentally undermines the core security model of Java by enabling untrusted applets to access information within trusted applets, thereby creating a significant bypass of the sandbox restrictions that are essential for Java's security architecture. The flaw exists in the security implementation of the Java Virtual Machine and affects the fundamental principle of isolation between trusted and untrusted code execution environments.
The technical nature of this vulnerability stems from insufficient access controls and information flow restrictions within the Java security framework. Specifically, the flaw allows malicious untrusted applets to exploit mechanisms that should prevent cross-applet information access, enabling them to retrieve sensitive data or execute code within the context of trusted applets. This represents a classic privilege escalation vulnerability where untrusted code gains elevated access rights through improper boundary enforcement between security domains. The vulnerability directly relates to CWE-284, which addresses improper access control, and CWE-250, concerning execution with unnecessary privileges, as the security model fails to properly enforce privilege boundaries.
The operational impact of this vulnerability is severe and far-reaching within Java-based environments. Attackers can leverage this flaw to bypass the Java security model entirely, potentially gaining access to sensitive system resources, user data, or executing arbitrary code with the privileges of trusted applets. This vulnerability affects web-based deployments where applets are loaded from untrusted sources, making it particularly dangerous in browser environments where users may inadvertently load malicious content. The implications extend beyond individual system compromise to potential network-wide exploitation, as compromised trusted applets could serve as entry points for broader attacks.
Organizations should implement immediate mitigations including upgrading to Java versions that address this vulnerability, typically those released after the patching of CVE-2003-1123. System administrators should disable Java applet execution in web browsers where possible, and implement network-level controls to restrict access to Java applet content. The mitigation strategy aligns with ATT&CK technique T1059.007 for command and script interpreter, as attackers could use this vulnerability to execute malicious code. Additionally, security monitoring should be enhanced to detect anomalous access patterns that might indicate exploitation attempts, particularly focusing on unauthorized information access within Java security domains. Regular security assessments and patch management processes should be strengthened to prevent similar vulnerabilities in future Java implementations.